Following are the data of an externally focusing telescope used for a tacheometric survey.
| Staff intercept | 1.52 m |
| Interval between stadia hair | 5 mm |
| Distance between the vertical axis of the telescope and the objective | 120 mm |
| Focal length of the objective | 0.3 m |
The value of the multiplying constant is ________.
1
24
2
2.5
3
60
4
12.67
5
120